﻿using System.Globalization;
using PicView.Core.Localization;

namespace PicView.Core.Sizing;

/// <summary>
/// Provides functionality to calculate and retrieve the dimensions of an image in different units for printing purposes.
/// </summary>
/// <remarks>
/// This class is designed to compute the printable sizes of an image in centimeters, inches, and megapixels,
/// based on the provided pixel dimensions and DPI (dots per inch). The computed values can be used in various contexts,
/// such as displaying or updating metadata for image files.
/// </remarks>
public static class PrintSizing
{
    /// <summary>
    /// Calculates and returns print sizes based on pixel dimensions and DPI values.
    /// </summary>
    /// <param name="pixelWidth">The width of the image in pixels.</param>
    /// <param name="pixelHeight">The height of the image in pixels.</param>
    /// <param name="dpiX">The horizontal DPI (dots per inch) of the image.</param>
    /// <param name="dpiY">The vertical DPI (dots per inch) of the image.</param>
    /// <returns>An instance of the PrintSizes structure containing print dimensions in centimeters, print dimensions in inches, and the image size in megapixels.</returns>
    public static PrintSizes GetPrintSizes(int pixelWidth, int pixelHeight, double dpiX, double dpiY)
    {
        var cm = TranslationManager.Translation.Centimeters;
        var mp = TranslationManager.Translation.MegaPixels;
        var inches = TranslationManager.Translation.Inches;
        var inchesWidth = pixelWidth / dpiX;
        var inchesHeight = pixelHeight / dpiY;
        var printSizeInch =
            $"{inchesWidth.ToString("0.##", CultureInfo.CurrentCulture)} x {inchesHeight.ToString("0.##", CultureInfo.CurrentCulture)} {inches}";

        var cmWidth = pixelWidth / dpiX * 2.54;
        var cmHeight = pixelHeight / dpiY * 2.54;
        var printSizeCm =
            $"{cmWidth.ToString("0.##", CultureInfo.CurrentCulture)} x {cmHeight.ToString("0.##", CultureInfo.CurrentCulture)} {cm}";
        var sizeMp =
            $"{((float)pixelHeight * pixelWidth / 1000000).ToString("0.##", CultureInfo.CurrentCulture)} {mp}";

        return new PrintSizes(printSizeCm, printSizeInch, sizeMp);
    }

    /// <summary>
    /// Represents the calculated dimensions and size of an image for printing purposes.
    /// </summary>
    /// <remarks>
    /// This struct is used to define the print sizes of an image in multiple units,
    /// including centimeters, inches, and megapixels. It is commonly utilized when
    /// determining the output characteristics of an image based on its pixel dimensions
    /// and DPI (dots per inch).
    /// </remarks>
    public readonly struct PrintSizes(string printSizeCm, string printSizeInch, string sizeMp)
    {
        /// <summary>
        /// Gets the dimensions of the image calculated for printing, expressed in centimeters.
        /// </summary>
        /// <remarks>
        /// This property provides the size of the image in centimeters when printed, based on its
        /// pixel dimensions and DPI (dots per inch). It is commonly used in image resizing,
        /// aspect ratio adjustments, and display of image details.
        /// </remarks>
        public string PrintSizeCm { get; } = printSizeCm;

        /// <summary>
        /// Gets the dimensions of the image calculated for printing, expressed in inches.
        /// </summary>
        /// <remarks>
        /// This property provides the size of the image in inches when printed, based on its
        /// pixel dimensions and DPI (dots per inch). It is useful in scenarios where precise
        /// print sizing is required for layout design or physical media output.
        /// </remarks>
        public string PrintSizeInch { get; } = printSizeInch;

        /// <summary>
        /// Gets the size of the image expressed in megapixels.
        /// </summary>
        /// <remarks>
        /// This property calculates and provides the total size of an image in megapixels
        /// based on its pixel dimensions. It is commonly used for determining
        /// the resolution and relative detail of the image, especially for printing or
        /// resizing purposes.
        /// </remarks>
        public string SizeMp { get; } = sizeMp;
    }
}